<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>浏览器对象模型(Browser Object Model)</title>
    <style type="text/css">
        #tab {
            margin: 0px auto;
            width: 500px;
            height: 500px;

        }

        td {
            border: solid 2px red;
            width: 100px;
            height: 100px;
            text-align: center;
            font-weight: bold;
        }
    </style>
    <script>
        var times = 0;
        var st;
        function fn() {
            times++;
            console.log(times);
            for (let i = 1; i <= 42; i++) {
                var tdObj = document.getElementById(i);
                tdObj.style.backgroundColor = 'white';
            }
            //获取1-9随机数
            var num = parseInt(Math.random() * 41 + 1);
            //获取对应的td对象
            var tdObj = document.getElementById( num);
            //设置背景颜色
            tdObj.style.backgroundColor = 'red';
            if (times >= 30) {
                //将结果显示到span中
                document.getElementById('sp').innerText = '恭喜你，获得了:' + tdObj.innerText;
                clearInterval(st);
            }
        }
        function start() {
            //清空:初始化白色背景
            times = 0;
            for (let i = 1; i <= 42; i++) {
                var tdObj = document.getElementById(i);
                console.log(tdObj);
                tdObj.style.backgroundColor = 'white';
            }
            //抽奖开始，将span中的文本设置成：正在抽奖中...
            document.getElementById('sp').innerText = '正在抽奖中...'
            //设定定时器,3秒后出结果
            st = setInterval(fn, 100);



        }
    </script>
</head>

<body>
    <div id="btn" style="text-align: center; margin:50px">
        <button onclick="start()">点击抽奖</button>
        <span id="sp"></span>
    </div>
    <table id="tab">
        <tr>
            <td id="1">郑玮喆</td>
            <td id="2">庄云</td>
            <td id="3">廖治先</td>
            <td id="4">郑文源</td>
            <td id="5">戴俊锋</td>
            <td id="6">陈昊童</td>
        </tr>
        <tr>
            <td id="7">谢金金</td>
            <td id="8">占志新</td>
            <td id="9">张淑芳</td>
            <td id="10">刘永潘</td>
            <td id="11">廖柏成</td>
            <td id="12">郑宗帅</td>
        </tr>
        <tr>
            <td id="13">李韦峰</td>
            <td id="14">吴欣燕</td>
            <td id="15">陈梅香</td>
            <td id="16">陈立智</td>
            <td id="17">袁贵森</td>
            <td id="18">赵浩敏</td>
        </tr>
        <tr>
            <td id="19">林世涛</td>
            <td id="20">罗启恒</td>
            <td id="21">卢国建</td>
            <td id="22">黄柱菘</td>
            <td id="23">陈鹏</td>
            <td id="24">张耀仁</td>
        </tr>
        <tr>
            <td id="25">陈华伟</td>
            <td id="26">张正豪</td>
            <td id="27">韦仲晓</td>
            <td id="28">黄富贵</td>
            <td id="29">陆建锋</td>
            <td id="30">曾德森</td>
        </tr>
        <tr>
            <td id="31">吴文龙</td>
            <td id="32">陆利群</td>
            <td id="33">黄雄</td>
            <td id="34">王世财</td>
            <td id="35">张先杰</td>
            <td id="36">胡基耀</td>
        </tr>
        <tr>
            <td id="37">马鑫涛</td>
            <td id="38">李涛</td>
            <td id="39">杨凌翔</td>
            <td id="40">罗此东</td>
            <td id="41">唐皓颖</td>
            <td id="42">白婉婷</td>
        </tr>
    </table>
</body>

</html>